<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <script>
        var a = 10;
        var b = 3;
        //加减乘除
        console.log(a + b); //13
        console.log(a - b); //7
        console.log(a * b); //30
        console.log(a / b); //3.3333333333333335

        //取余
        console.log(a % b); //1
    </script>
</body>
</html>